Can anybody explain about soft link?

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I link dir aaa to bbb, then i install a pgsql to bbb. Now the content of aaa and bbb are the same. I start pg use command /home/xxx/bbb/pg/bin/pg_ctl -D xxx /home/xxx/pg/data start, When i use ps to see it, the ps output is /home/xxx/aaa/pg/bin/pg_ctl -D xxx /home/xxx/pg/data start. I want to know why not all of it is aaa or bbb. submitted by /u/dianbanjiu [link] [comments]

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